MIAMI -- Even if voters approve using tax money to help upgrade the Miami Dolphins' stadium, a deal might be contingent on the NFL awarding the 2016 Super Bowl to the city.

The Dolphins confirmed Monday, Feb. 11, that they've reversed their position and agreed to a referendum. A no vote would scuttle the plan.

Miami-Dade County Mayor Carlos Gimenez says that should the measure pass, county commissioners still ought to have final approval -- and insist on assurances from the NFL that the city will host the 50th Super Bowl in 2016.

The Dolphins hope the referendum can be held before May 22, when league owners are expected to choose the host for the milestone Super Bowl. Miami and San Francisco are the finalists.